Chinese State Councilor and Foreign Minister Qin Gang on Wednesday visited and delivered a speech at the Potsdam Conference site in Berlin, Germany, emphasizing maintaining the post-war international order and achieving China's national unity.

Qin said that the Potsdam Conference held in 1945 played an important role in establishing the international order after the World War II and had historical significance to the Chinese people.

The Potsdam Conference had special impact on China as the Potsdam Declaration issued after the conference reaffirmed the provisions of the Cairo Declaration, that all the territories Japan had stolen, including Taiwan, shall be restored to China, Qin added.

"This is a significant achievement of the World Anti-Fascist War. It is what 35 million Chinese soldiers and civilians had fought for shedding blood and lives" he said.

Qin said that the United States had completely ignored the Potsdam Declaration it originally drafted, supporting and conniving with 'Taiwan independence' separatist activities, which undermines the post-war international order and damages China's sovereignty and territorial integrity.

"The post-war international order must be maintained! International fairness and justice must be upheld! Pursuing 'Taiwan independence' and splitting the country challenges international justice and order, moving against the tide of history, and it is doomed to be a dead end," said Qin. "The reunification of China must be realized!"

He also left a message on the guestbook which reiterated the maintenance on post-war order, world's peaceful development and the dedication to realize China's national reunification.